9.1 Finding Square Roots

9.1 Finding Square Roots

8.EE.A.2

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Find the side length of the square.

Enter only a numeric answer.

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Find the side length of the square.

Enter only a numeric answer.

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Challenge: Find the side length of the square.

Enter your answer as a fraction.

How do you find a square root?

• Opposite of squaring a number

• ​

• What number multiplied by itself gives you the # underneath the radical?

PERFECT SQUARE

A number with integers as its square roots

Multiple Choice

Find the two square roots of the number:

36

• 6

• -6

• 36; -36

• 6; -6

Multiple Choice

Find the two square roots of the number:

100

• 10; -10

• -10

• 10

• 100; -100

Multiple Select

Select the 2 square roots of the number below.

121

• 11

• -11

• 121

• -121

Multiple Choice

Find the square root.

$$\sqrt{4}$$  

• 2

• -2

• $$\pm2$$  

• None of these

Multiple Choice

Find the square root.

 $-\sqrt{81}$  

• 9

• -9

•  $\pm9$  

• None of these

Multiple Choice

Find the square root.

 $\pm\sqrt{64}$  

• 8

• -8

•  $\pm8$  

• None of these

Multiple Choice

Find the square root(s). $$-\sqrt{\frac{1}{100}}$$  

• -10

• 1/10

• -1/10

• $$\pm$$  1/10

Multiple Choice

Find the square root(s).

 $\pm\sqrt{\frac{4}{25}}$  

•  $\pm\frac{2}{5}$  

•  $\frac{2}{5}$  

•  $\frac{5}{2}$  

•  $-\frac{2}{5}$  

Multiple Choice

Find the square root(s). $$\sqrt{12.25}$$  

Hint: Improper fraction!

• $$-\frac{2}{7}$$  

• $$\frac{7}{2}$$  

• $$\pm\frac{7}{2}$$  

• 7.2

Poll

How do you feel about finding square roots?

• 1 - Very confused

• 2

• 3 - It makes sense, but I will need to practice a lot.

• 4

• 5 - I can solve these problems on my own...without a calculator.

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Evaluate the expression. $$12-3\sqrt{25}$$  

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Evaluate the expression. $$\sqrt{\frac{28}{7}}+2.4$$  

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Evaluate the expression. $$15-\left(\sqrt{4}\right)^2$$  

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Solve the equation. $$k^2=169$$  

Enter either positive or negative square root as your answer.

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Solve the equation. $$7n^2=175$$  

Enter either positive or negative square root as your answer.

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Solve the equation. $$190=4b^2-6$$  

Enter either positive or negative square root as your answer.

Poll

How do you feel about evaluating square roots and solving equations using square roots?

• 1 - Completely lost

• 2 - I understand square roots, but this is confusing

• 3 - Eh. Okay

• 4 - Good. I will just need a little more practice

• 5 - Great!